std::shared_ptr

From Cppreference

C++ Standard Library
Language Utilities library Strings library Containers library Algorithms library Iterators library Numerics library Input/output library Localizations library Regular expressions library (C++11) Atomic operations library (C++11) Thread support library (C++11)
Utilities library
Dynamic memory management
Low level memory management Allocators allocator allocator_traits (C++11) allocator_arg_t (C++11) allocator_arg (C++11) uses_allocator (C++11) scoped_allocator_adaptor (C++11) Uninitialized storage uninitialized_copy uninitialized_copy_n (C++11) uninitialized_fill uninitialized_fill_n raw_storage_iterator get_temporary_buffer return_temporary_buffer Smart pointers unique_ptr (C++11) shared_ptr (C++11) weak_ptr (C++11) auto_ptr (deprecated) owner_less (C++11) enable_shared_from_this (C++11) bad_weak_ptr (C++11) default_delete (C++11) Garbage collection support declare_reachable (C++11) undeclare_reachable (C++11) declare_no_pointers (C++11) undeclare_no_pointers (C++11) pointer_safety (C++11) get_pointer_safety (C++11) Miscellaneous pointer_traits (C++11) address_of (C++11) align (C++11) C Library malloc calloc realloc free
std::shared_ptr
Member functions shared_ptr::shared_ptr shared_ptr::~shared_ptr shared_ptr::operator= Modifiers shared_ptr::reset shared_ptr::swap Observers shared_ptr::get shared_ptr::operator* shared_ptr::use_count shared_ptr::unique shared_ptr::operator bool shared_ptr::owner_before Non-member functions std::swap make_shared allocate_shared static_pointer_cast dynamic_pointer_cost const_pointer_cast

Defined in header <memory>
template< class T > class shared_ptr;		(C++11 feature)

std::shared_ptr is a smart pointer that manages lifetime of an object, typically allocated with new. Several shared_ptr objects may manage the same object; the object is destroyed when the last remaining shared_ptr pointing to it is destroyed or reset. The object is destroyed using delete-expression or a custom deleter that is supplied to shared_ptr during construction.

Contents 1 Member types 2 Member functions 2.1 Modifiers 2.2 Observers 3 Non-member functions 4 Helper classes

[edit] Member types

Member type	Definition
element_type	T

[edit] Member functions

(constructor)	constructs new shared_ptr (public member function)
(destructor)	destructs the owned object if no more shared_ptrs link to it (public member function)
operator=	assigns the shared_ptr (public member function)
Modifiers
reset	replaces the managed object (public member function)
swap	swaps the managed objects (public member function)
Observers
get	returns a pointer to the managed object (public member function)
operator* operator->	dereferences pointer to the managed object (public member function)
use_count	returns the number of shared_ptr objects referring to the same managed object (public member function)
unique	checks whether the managed object is managed only by the current shared_ptr instance (public member function)
operator bool	checks if there is associated managed object (public member function)
owner_before	provides owner-based ordering of shared pointers (public member function)

[edit] Non-member functions

make_shared	creates a shared pointer that manages a new object (function template)
allocate_shared	creates a shared pointer that manages a new object allocated using an allocator (function template)
static_pointer_cast dynamic_pointer_cost const_pointer_cast	applies static_cast, dynamic_cast or const_cast to the type of the managed object (function template)
get_deleter	returns the deleter of specified type, if owned (function template)
operator== operator!= operator< operator<= operator> operator>=	compares with another shared_ptr or with nullptr (function template)
operator<<	outputs the value of the managed pointer to an output stream (function template)
std::swap(std::shared_ptr) (C++11)	specializes the std::swap() algorithm (function template)
std::atomic_is_lock_free(std::shared_ptr) std::atomic_load(std::shared_ptr) std::atomic_load_explicit(std::shared_ptr) std::atomic_store(std::shared_ptr) std::atomic_store_explicit(std::shared_ptr) std::atomic_exchange(std::shared_ptr) std::atomic_exchange_explicit(std::shared_ptr) std::atomic_compare_exchange_weak(std::shared_ptr) std::atomic_compare_exchange_strong(std::shared_ptr) std::atomic_compare_exchange_weak_explicit(std::shared_ptr) std::atomic_compare_exchange_strong_explicit(std::shared_ptr)	specializes atomic operations (function template)

[edit] Helper classes

std::hash<std::shared_ptr> (C++11)	hash support for std::shared_ptr (class template specialization)